Efficiency of motor

To compare the operating costs of an existing standard motor with an appropriately-sized energy- efficient replacement, you need to determine operating hours, efficiency improvement values, and load. The Premium Efficiency Motor Selection and Application Guide and its companion publication, Continuous Energy Improvement in Motor- Driven Systems, have been developed by the U. Department of Energy (DOE) Office of Energy Efficiency and. Renewable Energy (EERE) with support from the . Electrical Motor Efficiency when Shaft Output is measured in Horsepower.

Pout = shaft power out (horsepower, hp).

Pin = electric power in to the motor (Watt, W) .

An often overlooked and widely misunderstood characteristic of electric motors is power factor (PF). Proper electric motor application and . The energy it uses is measured on an energy meter: J . The useful work done lifting it is found from the gravitational potential energy formula: GPE = mgh = 0. If the motor has 1 efficiency all electrical power is converted to mechanical energy. However such motors do not exist.

Motors built from our kits usually have maximum efficiency of about . This efficiency of motor is affected by few losses which include resistance losses, mechanical losses due to friction, losses due to dissipation of magnetic energy in core and different losses depending upon type of material used.

To effectively evaluate the benefits of high efficiency electric motors, we must define efficiency. For an electric motor, efficiency is the ratio of mechanical power . Furthermore 8-pole motors and an extended . Understanding motor efficiency losses matters because less . It is possible to derive analytically the point of maximum efficiency. Various regulatory authorities in many countries have introduced and implemented legislation to encourage the manufacture and use of higher- efficiency electric motors. The efficiency of an entity in electronics and electrical engineering is defined as useful power output divided by the total electrical power consumed (a fractional expression), typically denoted by the Greek small letter eta (η – ήτα).

A critical provision that NEMA focused on was increased motor efficiency levels.

The Motor Generator section of NEMA joined forces with the American Council for an Energy Efficient Economy to draft and recommend new motor efficiency regulations covering both . Electric motor efficiency is the ratio between power output and power input. Design of an electric motor aims to minimize these losses to improve efficiency. In addition, motors are naturally supplied to conform to local Minimum energy . The cost of electricity depends upon the amount of electrical power use the amount of time it is used for, and the charge made for each unit of electricity.

A motor is used to lift various small masses.

This article is excerpted from Premium- Efficiency Motors and Transformers, a CD-ROM available from CDA by going to the Energy Effficiency Publications and follow the instructions for ordering. At the same time, it can improve .